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by spatular
3695 days ago
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To expand a bit on construction: it's possible to take a long tube, put a fresnel lens at front, pyroelectric sensor with rotating shutter at the other end. Scan by rotating it with reductors/steppers as a whole. It's also possible to cool tube with contents down to -70 with dry ice to cut on background heat radiation. Maybe it'll lessen noise in pyroelectric sensor, maybe not (and it's quite easy to buy dry ice in Moscow). |
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